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External Numpad?

Which TRS-80? There was an internal numpad sold for the Model I for programmers needing hexadecimal. Offhand, I don't know of an external pad, as the other models had the numeric pad integral to the system.
 
The Model I had a 12 key numpad (0-9, period & Enter keys) that Radio Shack offered. Radio Shack never offered a hexadecimal keypad as an option. Any external keypads would have been home made or an aftermarket item. "The Custom TRS-80 & Other Mysteries" documented an internal hex keypad installation.

Tom
 
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